imponderable | (adjective) difficult or impossible to evaluate with precision | - |
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(noun) a factor whose effects cannot be accurately assessed | - |
impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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impregnable | (adjective) capable of conceiving | Synonyms: conceptive |
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(adjective) immune to attack; incapable of being tampered with | Synonyms: inviolable, secure, strong, unassailable, unattackable |
(adjective) incapable of being overcome, challenged or refuted | Synonyms: inexpugnable |
impressionable | (adjective) easily impressed or influenced | Synonyms: impressible, waxy |
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improbable | (adjective) not likely to be true or to occur or to have occurred | Synonyms: unlikely |
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(adjective) having a probability too low to inspire belief | Synonyms: unbelievable, unconvincing, unlikely |
(adjective) too improbable to admit of belief | Synonyms: marvellous, marvelous, tall |
improvable | (adjective) susceptible of improvement | - |
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impugnable | (adjective) subject to being discredited | - |
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imputable | (adjective) capable of being assigned or credited to | Synonyms: ascribable, due, referable |
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inadvisable | (adjective) not prudent or wise; not recommended | Synonyms: unadvisable |
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(adjective) not advisable | - |
inalienable | (adjective) incapable of being repudiated or transferred to another | Synonyms: unalienable |
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(adjective) not subject to forfeiture | Synonyms: unforfeitable |
inalterable | (adjective) not capable of being changed or altered | Synonyms: unalterable |
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inapplicable | (adjective) not capable of being applied | Synonyms: unsuitable |
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inappreciable | (adjective) too small to make a significant difference | - |
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inarguable | (adjective) against which no argument can be made | Synonyms: unarguable |
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incalculable | (adjective) not able to be computed or enumerated | - |
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(adjective) too much to be measured | Synonyms: untold |
incapable | (adjective) (followed by `of') lacking capacity or ability | - |
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(adjective) (followed by `of') not having the temperament or inclination for | - |
(adjective) not meeting requirements | Synonyms: incompetent, unequal to |
(adjective) not being susceptible to or admitting of something (usually followed by `of') | - |
incognizable | (adjective) incapable of being perceived or known | Synonyms: incognoscible |
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incommensurable | (adjective) not having a common factor | - |
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(adjective) impossible to measure or compare in value or size or excellence | - |
incommutable | (adjective) not subject to alteration or change | - |
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(adjective) not interchangeable or able to substitute one for another | - |
incomparable | (adjective) such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | Synonyms: uncomparable |
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incomputable | (adjective) beyond calculation or measure | Synonyms: immeasurable, inestimable |
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inconceivable | (adjective) totally unlikely | Synonyms: impossible, out of the question, unimaginable |
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inconsiderable | (adjective) too small or unimportant to merit attention | - |
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inconsolable | (adjective) sad beyond comforting; incapable of being consoled | Synonyms: disconsolate, unconsolable |
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incontestable | (adjective) incapable of being contested or disputed | Synonyms: incontestible |
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(adjective) not open to question; obviously true | Synonyms: indisputable, undisputable |
inculpable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, irreproachable, unimpeachable |
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incurable | (adjective) incapable of being cured | - |
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(adjective) unalterable in disposition or habits | - |
(noun) a person whose disease is incurable | - |
indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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(adjective) impossible to determine the meaning of | - |
indefatigable | (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: tireless, unflagging, unwearying |
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indefinable | (adjective) defying expression or description | Synonyms: indescribable, ineffable, unspeakable, untellable, unutterable |
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(adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: undefinable |
indescribable | (adjective) defying expression or description | Synonyms: indefinable, ineffable, unspeakable, untellable, unutterable |
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indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
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(adjective) incapable of being definitely ascertained or calculated | - |
indictable | (adjective) liable to be accused, or cause for such liability | Synonyms: chargeable |
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indispensable | (adjective) not to be dispensed with; essential | - |
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(adjective) absolutely necessary; vitally necessary | Synonyms: essential |
(adjective) unavoidable | - |
indisputable | (adjective) impossible to doubt or dispute | Synonyms: sure |
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(adjective) not open to question; obviously true | Synonyms: incontestable, undisputable |
indistinguishable | (adjective) not capable of being distinguished or differentiated | Synonyms: undistinguishable |
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(adjective) exactly alike; incapable of being perceived as different | Synonyms: identical |
indomitable | (adjective) impossible to subdue | Synonyms: never-say-die, unsubduable |
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indubitable | (adjective) too obvious to be doubted | Synonyms: beyond doubt |
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ineffable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, unspeakable, untellable, unutterable |
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(adjective) too sacred to be uttered | Synonyms: unnameable, unspeakable, unutterable |
ineluctable | (adjective) impossible to avoid or evade | Synonyms: inescapable, unavoidable |
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inequitable | (adjective) not equitable or fair | Synonyms: unjust |
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ineradicable | (adjective) not able to be destroyed or rooted out | - |
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inerrable | (adjective) not liable to error | Synonyms: inerrant, unerring |
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inescapable | (adjective) impossible to avoid or evade | Synonyms: ineluctable, unavoidable |
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inestimable | (adjective) beyond calculation or measure | Synonyms: immeasurable, incomputable |
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inevitable | (adjective) incapable of being avoided or prevented | - |
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(adjective) invariably occurring or appearing | - |
(noun) an unavoidable event | - |
inexcusable | (adjective) without excuse or justification | - |
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(adjective) not excusable | Synonyms: unforgivable |
inexorable | (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, relentless, stern, unappeasable, unforgiving, unrelenting |
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(adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, intransigent |
inexpiable | (adjective) incapable of being atoned for | - |
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inexplicable | (adjective) incapable of being explained or accounted for | Synonyms: incomprehensible |
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inexpugnable | (adjective) incapable of being overcome, challenged or refuted | Synonyms: impregnable |
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inexpungeable | (adjective) not capable of being expunged | Synonyms: inexpungible |
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inexterminable | (adjective) incapable of extermination or extirpation | Synonyms: inextirpable |
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inextinguishable | (adjective) difficult or impossible to extinguish | - |
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inextirpable | (adjective) incapable of extermination or extirpation | Synonyms: inexterminable |
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inextricable | (adjective) not permitting extrication; incapable of being disentangled or untied | - |
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inflammable | (adjective) easily ignited | Synonyms: flammable |
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inflatable | (adjective) designed to be filled with air or gas | - |
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inhabitable | (adjective) fit for habitation | Synonyms: habitable |
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inheritable | (adjective) capable of being inherited | Synonyms: heritable |
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inhospitable | (adjective) unfavorable to life or growth | - |
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(adjective) not hospitable | - |
inimitable | (adjective) defying imitation; matchless | - |
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injectable | (adjective) (used of drugs) capable of being injected | - |
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innumerable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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inoperable | (adjective) not suitable for surgery | - |
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(adjective) not able to perform its normal function | - |
insatiable | (adjective) impossible to satisfy | Synonyms: insatiate, unsatiable |
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inscrutable | (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, mysterious, mystifying |
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inseparable | (adjective) not capable of being separated | - |
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insolvable | (adjective) not easily solved | Synonyms: unresolvable, unsoluble, unsolvable |
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insufferable | (adjective) unbearably arrogant or conceited | - |
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(adjective) too extreme to bear | Synonyms: unsufferable |
insuperable | (adjective) incapable of being surmounted or excelled | Synonyms: unconquerable |
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(adjective) impossible to surmount | Synonyms: insurmountable |
insupportable | (adjective) incapable of being justified or explained | Synonyms: indefensible, unjustifiable, unwarrantable, unwarranted |
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insurable | (adjective) capable of being insured or eligible to be insured | - |
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insurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: unsurmountable |
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(adjective) impossible to surmount | Synonyms: insuperable |
interchangeable | (adjective) capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability | Synonyms: exchangeable, similar, standardised, standardized |
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(adjective) (mathematics, logic) such that the arguments or roles can be interchanged | - |
interminable | (adjective) tiresomely long; seemingly without end | Synonyms: endless, eternal |
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interoperable | (adjective) able to exchange and use information | - |
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interpretable | (adjective) capable of being understood | Synonyms: explainable |
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intolerable | (adjective) incapable of being tolerated or endured | Synonyms: unbearable, unendurable |
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intractable | (adjective) not tractable; difficult to manage or mold | - |
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introuvable | (adjective) impossible to find | - |
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invaluable | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: priceless |
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invariable | (adjective) not liable to or capable of change | - |
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(noun) a quantity that does not vary | Synonyms: constant, constant quantity |
inviolable | (adjective) incapable of being transgressed or dishonored | - |
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(adjective) not capable of being violated or infringed | Synonyms: absolute, infrangible |
(adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, secure, strong, unassailable, unattackable |
(adjective) must be kept sacred | Synonyms: inviolate, sacrosanct |
invulnerable | (adjective) immune to attack; impregnable | - |
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irreclaimable | (adjective) insusceptible of reform | Synonyms: irredeemable, unredeemable, unreformable |
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irreconcilable | (adjective) impossible to reconcile | Synonyms: unreconcilable |
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irrecoverable | (adjective) incapable of being recovered or regained | Synonyms: unrecoverable |
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irredeemable | (adjective) (of paper money) not convertible into coin at the pleasure of the holder | - |
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(adjective) insusceptible of reform | Synonyms: irreclaimable, unredeemable, unreformable |
irrefutable | (adjective) impossible to deny or disprove | Synonyms: incontrovertible, positive |
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irremediable | (adjective) impossible to remedy or correct or redress | - |
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irremovable | (adjective) incapable of being removed or away or dismiss | - |
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irreparable | (adjective) impossible to repair, rectify, or amend | - |
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irreplaceable | (adjective) impossible to replace | Synonyms: unreplaceable |
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irreproachable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, unimpeachable |
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irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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irrevocable | (adjective) incapable of being retracted or revoked | Synonyms: irrevokable |
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irrevokable | (adjective) incapable of being retracted or revoked | Synonyms: irrevocable |
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irritable | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
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(adjective) capable of responding to stimuli | Synonyms: excitable |
(adjective) abnormally sensitive to a stimulus | - |
isolable | (adjective) capable of being isolated or disjoined | - |
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